Collapse/expand all files in tree

Co-authored-by: Stefan Haller <stefan@haller-berlin.de>

pkg/gui/filetree/file_tree.go

@@ -31,6 +31,8 @@ type ITree[T any] interface {
 	IsCollapsed(path string) bool
 	ToggleCollapsed(path string)
 	CollapsedPaths() *CollapsedPaths
+	CollapseAll()
+	ExpandAll()
 }
 
 type IFileTree interface {
@@ -171,6 +173,20 @@ func (self *FileTree) ToggleCollapsed(path string) {
 	self.collapsedPaths.ToggleCollapsed(path)
 }
 
+func (self *FileTree) CollapseAll() {
+	dirPaths := lo.FilterMap(self.GetAllItems(), func(file *FileNode, index int) (string, bool) {
+		return file.Path, !file.IsFile()
+	})
+
+	for _, path := range dirPaths {
+		self.collapsedPaths.Collapse(path)
+	}
+}
+
+func (self *FileTree) ExpandAll() {
+	self.collapsedPaths.ExpandAll()
+}
+
 func (self *FileTree) Tree() *FileNode {
 	return NewFileNode(self.tree)
 }